- Actix, Inc.
- America Online
- American Alliance for Health, Physical Education, Recreation & Dance
- American Association for Engineering Societies
- American College of Nurse-Midwives
- American Society for Pharmacology and Experimental Therapeutics
- American Technology Services
- Amtrak
- AT&T
- Bert Smith & Co.
- Birch, Stewart, Kolasch & Birch, LLP
- Bradford Real Estate Group
- Buchanan Partners
- Canton Maritime Services
- Chesapeake Technology International Corp.
- Computer Packages Inc.
- Council for Advancement and Support of Education
- CRDF Global
- Drs. Love & Miller, P.C.
- Efficiency Vermont
- Electric Technologies Incorporated
- EPDM Roofing Association
- Facility Engineering Associates, PC
- Granite Center
- Guest Services, Inc.
- Howard University
- Inova Health System
- Inter-American Development Bank
- International Association of Chiefs of Police
- IPA Institute
- JGM Construction, Inc.
- Jones Lang LaSalle
- Leros Technologies Corp.
- Mortgage Bankers Association
- Murray, Jonson, White & Associates, Ltd., PC
- National Association for Variable Annuities
- National Glass Association
- National Institute of Governmental Purchasing
- National Investor Relations Institute
- National Leased Housing Association
- Natural Gas Supply Association
- Newspaper Association of America
- Polyisocyanurate Insulation Manufacturers Association
- Pragmatic Solutions Inc.
- SecureIT
- SkyBitz
- Smith & Harroff
- Society for Industrial Microbiology
- Spriggs & Hollingsworth
- Stone and Spring, CPAs
- Sybase 365
- The Federal Market Group
- Tower-Davis Electric
- Truland Systems Corp.
- University of Maryland University College
- U.S. Department of Labor
